In late June of 1950, North Korean forces crossed the 38th Parallel into South Korea beginning the Korean War.
Shortly after the North Korean invasion, the United Nations security council and the United States responded by deploying soldiers to help reinforce the South Korean lines. By August 1950 the North Korean offensive had pushed deep into South Korea and the South Korean and UN forces only held onto a small 140-mile area around Pusan - known as the Pusan Perimeter. To counter this defensive position, the UN forces landed at Inchon Harbor, on the northwest coast of South Korea, on September 15, 1950.
The landing was a complete surprise to the North Korean forces, and the UN forces quickly captured the city of Inchon by the afternoon of September 16. On September 17, the UN ground forces captured nearby Kimpo airfield which started receiving supplies of vehicles, troops and supplies on September 19. The recapture of the South Korean capitol of Seoul took until late September, with heavy North Korean fighting taking place throughout the city. Also in late September, members of the UN landing forces met up with troops from the Pusan Perimeter who were finally able to breakout of the North Korean perimeter.
The North Koreans, stuck between UN forces to the north and south, and with their supply lines in shambles, were forces to retreat back north with UN forces hot on their heels.
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